I have come across a few folks who share, like or retweet everything they see. Is there a word to indicate their behavior/attitude/nature?
For someone who's twitter account is largely unoriginal content I'd describe them as a Retwit.
If they are chiefly doing this on Twitter you could call them chirpy:-
- Characterized by chirping tones: a bird with a chirpy song.
- Tending to chirp: a chirpy parakeet.
- Cheerful and good-humored: a chirpy radio announcer.