Requests to be friends from people who have never written a blog on their blog site seems rather like asking other people to walk through thick fog and come out nowhere. 
Then there are requests from wannabe-bloggers who only regurgitate text books on, what might be, their specialist subject. Then again, it probably is not. It is just an easy option that avoids a bit of personal thinking, or heaven forfend! Originality.
Bushka
Pro
Agreed! Really waste of time....

You can always 'deny'....and if you already have one or other on your list...you can always 'delete'!