[b]Both.[/b] Some people, especially the ones that you don't know, follow you because they want to see what you have to share (i.e. photos, quotes, videos, music, etc.).
If you post too much about your life or a play-by-play on what you did during the day, then they may get bored and unfollow you. I'm not saying everyone is like that, but some do. I only reblog the ones I feel like I can totally relate to, or the ones I want to share with my followers, too.
Although, I do my best to blog every now and then. But with my hectic schedule at the moment, I don't really have time to blog about anything so I just stick with reblogging.
Hopefully, I'll be able to post some more blogs of mine, though.