Believe it or not, there are tells in online poker. 1 of the huge tells is how fast the opposing players clicks to bet, raise, or check. If you doubt me, go watch a game of 10/20 or 20/40 for about an hour.
Now I know some people have bad connections online, but over time u can weed out the bad connections, or even check the other players connection speed (at some sites)
Watch the chat also, you would amazed at the tells that come from it over time.
TIP, When sitting at a poker table, be it "online" or "live" always try and sit at the table with more chips then anyone at the table, you will have a significant advantage psychologically over your opponents. Also, if playing "live" ask for a seat cushion to sit on. This seat cushion plays some vital roles: provides comfort, elevates you above the rest of the table, hence giving you a psychological advantage over your opponents and gives you a great view of the board.
I wish I could give praise for that advice, but I forgot where I read it.
By the way, I'm the orange cat