An alert if you have notifications on, it could be seen as a request from a certain point of view. I guess ‘nothing’ could be right since EVERY device with the same app wouldn’t get any notice. And “the post appears..” could be true if the apps on the other devices are open when posted and they refresh the feed.
A star is a type of astronomical object consisting of luminous spheroid of plasma held together by its own gravity. They are basically contains hydrogen and helium gas. They have a composition of 92.1% hydrogen atoms and 7.8% helium atoms.