I check these sites once or twice a day, but I don't live on them. I knit, read a lot, email my daughters, house stuff....
First thing I suggest with Pinterest... Unfollow everyone!! Then be selective. If you like cooking, search for specific topics or people. (Like Martha Stewart, dairy free, knitting, etc.) the select only the boards you are interested in. For instance you might be interested in Martha Stewart desserts, but not crafts. I have a board for holiday decorating, things I love, great ideas I've seen, healthy food.... If you personalize it it makes it useful. I've looked up recipes I've saved for and printed them to use. I usually pin stuff I've seen on there only. Only a few were things I found on the Internet.