It's the light-blue app with a white bird. Log in with your email, phone number, or username and password, if you aren't logged in automatically. It's located in the top-right corner of the tweet. Promoted tweets have a "Promoted" tag at the bottom. Instead of "account",  this will display the Twitter account of the company or service that promoted the tweet. This will open a pop-up window asking you to confirm. Blocked accounts will not be able to follow or message you and their tweets and ads will not appear in your timeline.  Tap Undo in the bar at the bottom to immediate unblock the Twitter account. You can always unblock a Twitter account later at any time.
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One-sentence summary -- Open Twitter. Tap  on the tweet. Tap Block @account. Tap Block to confirm.

Q: Selenium is a trace mineral that has an essential role in ensuring good brain health, particularly as an antioxidant. Studies have found that depleted levels of selenium result in poor memory, bad moods, and decreased cognitive function, while increasing selenium improves mood, clarity of thinking, and energy levels. You need to get at least 55 micrograms daily. Try foods such as whole grain bread, tuna, and Brazil nuts. One great source of zinc is pumpkin seeds. Zinc is helpful for improving brain power, and just a 1/4 cup provides almost 20 percent of your daily value. Other good sources include spinach, beef, and kidney beans.  Try eating a small handful of pumpkin seeds as an afternoon snack, or sprinkle them over salad or oatmeal for added texture. Many of the foods already listed here are high in antioxidants, such as berries and leafy greens. However, certain drinks are high in antioxidants, too, including tea and coffee. Green tea is particularly beneficial for the brain. Try drinking a cup of tea or two a day. Antioxidants help block free radicals, which can destroy brain cells over time. Omega 3 is excellent brain food, providing a good source of EPA and DHA fatty acids and helping to protect your brain from deterioration. Not getting enough of these fatty acids in your diet can increase your chances of getting Alzheimer's or dementia. Oily fish (e.g., salmon, sardines, herring, tuna), fish oil, walnuts, and flax seeds (linseed) are all good sources of omega-3.  Try chia seeds, which are loaded with ALA and EHA omega-3. They are easy to sprinkle over everything from cereal to salads, as they are flavorless.
A: Eat selenium-rich foods. Increase your zinc. Consume foods rich in antioxidants. Improve your omega-3 intake.

Article: If you are using nuts, dried fruit, or chia seeds, sprinkle them over the surface of the chocolate during this step and quickly fold or mix them in. Scoop the chocolate mixture up using a large serving spoon and transfer it into your lined pan. Once all the chocolate is in the pan, quickly smooth out the top using your scraper or palette knife.  If you use molds instead of a square tin, spoon the chocolate mixture into a bottle or disposable decorating bag and squeeze it into the molds one by one. Once all the molds are filled, lightly tap the molds on your counter to pop any air bubbles that may have formed.  If you want to make chocolate chips, spoon the chocolate mixture into a pastry bag with a narrow tip and pipe the chocolate chips out onto a baking sheet lined with wax paper or parchment paper. Allow the chocolate to harden on its own. You can leave it out at room temperature as it sets, place it in the refrigerator, or place it in the freezer.  If you cool the chocolate in the freezer, it should be ready within 30 minutes or so. In the refrigerator, the mixture may take a little over 1 hour. At room temperature, the mixture might take several hours to set. Note that dark chocolate made with honey or maple syrup may not set sufficiently at room temperature. Cool the candy in the refrigerator or freezer, instead. Once the chocolate has completely hardened, remove it from the pan and peel away the wax or parchment paper. To remove dark chocolate from molds, turn the the mold upside-down over a sheet of parchment paper or wax paper. Tap on the bottom of the molds with your fingers or a butter knife, or carefully flex the mold to loosen the candies. The chocolate should fall out of the molds as you do this. Your dark chocolate bar is ready to enjoy at this point; eat it as a whole bar or snap it into smaller chunks. If you aren't quite ready to eat it yet, though, wrap the dark chocolate in a clean sheet of wax paper or place it in a resealable plastic bag to save it for another time. Dark chocolate made with sugar can be stored at room temperature. If you make it with honey or maple syrup, however, the chocolate should be stored in the refrigerator.
Question: What is a summary of what this article is about?
Mix in your optional ingredients. Pour the chocolate into the prepared pan. Set until hardened. Remove the finished chocolate from the pan. Eat now or save it for later.

Article: Put your hair up in a ponytail or a bun to show off your dyed hair and keep the dye from getting on your clothes. You can also put your hair in braids to show off the dyed strands. The chalk in your hair will start to rub off and flake colored dust over time. Prevent your clothing from getting dyed by the chalk by wearing clothing that matches the colors in your hair, especially tops.  You may also wear tops that you don’t mind getting color on. Chalk dye should come off in the wash on most materials. The chalk may dye your pillow as you sleep, so use a towel on your pillow to protect it. You may also sleep with sheets that you do not mind getting chalk on. Chalk color should come out of sheets and pillowcases in the wash. If you have blonde hair or light-colored hair, it may last longer. As you wash your hair, the chalk color should fade.  If you want to remove the chalk dye before 2-4 washes, you can try brushing your dry hair and then scrubbing out the dye in the shower with shampoo and water. When you wash your dyed hair, use clarifying shampoo so your hair stays clean and healthy. Chalk dyeing your hair can be very drying, as the chalk will suck moisture out of your hair. Make sure you use a good hair conditioner on your chalk dyed hair to replenish moisture. Chalk-dyeing your hair should not be done too often, as it can be very drying for your hair. Try spreading out when you chalk dye so you only do it a few times a year your hair. This will ensure your hair does not become damaged due to the chalk.
Question: What is a summary of what this article is about?
Style your dyed hair in an up-do or braids. Wear clothing close to the colors in your hair. Protect your pillow by sleeping on a towel. Maintain chalk dyed hair for 2-4 washes. Condition your hair to keep it soft and healthy. Do not chalk dye your hair regularly.