Feeds are a bit different - they're made by individuals, & that person chooses how their Feed works: For instance, I chose that only "#Keyword" (and NOT "Keyword") will show up to avoid random posts where the word "flat" appears, & I chose that posts with "#Keyword" in both ALT & Post Text appears.

however, ALT Text can contain more characters than Post Text, allowing you to include more words that can be a potential "hit" when people use the Search Bar to look for posts. basically, posts containing your keyword in ALT Text ("#Keyword" & "Keyword" alike) will show up in the search.

Depends on your motivation for being here, it's a little different than the other spots. Post and reply to your own interests and everything should fall into place. Begin with a starter pack or do "#keyword" searches to find people with similar interests.