Because of age and health I have tried to cancel my account with Linkedin. They still have my info up, will not take it down. I still get invites from friends, but can not close down my site. Keep in mind that they sell your info, so they lose money when you try to quit.
Having tried to post a comment many times, they never get posted even though everything in the process seems OK.. I suspect Yahoo only allows selected people to comment. How sad. Also, they are partly funded by Wells Fargo. I'll never trust Yahoo again.