There are currently a lot of complaints on boards that people are not gaining or losing LP after playing their ranked games. Riot noticed this issue, so there's no point in making 50 threads about it.
"Network Operations – Yesterday at 11:00 PM
We're aware of a problem causing LP gains and losses to fail to appear, and are working on a fix."
Posting is not going to solve the problem, you know? Next time, just check the server status. Takes less time. I can understand people complaining if they don't gain their LP which they were supposed to, but that hasn't happened yet, and Riot is working on it.