I wrote something like this before and posted it, but deleted it a couple days later because I didn't want to hurt anyone's feelings. But now after certain events unfolded, I really don't care now. lol.
A really good friend of mine was dating a guy that still had pictures of his ex wife up in his facebook. Now, I never knock anyone for the shit they put up on their facebook, trust me I don't judge, BUT!!! when you have pictures of your ex wife, in kissing pics and in an album called the "Wifey" and you're officially dating another girl, and you're constantly on FB, fully aware of the pics you have... that's pretty shitty imo.
I still have a pic of Jace on my FB but its from when we were in Cali for Blizzcon. Hello?!!??! Blizzcon, you don't hide those pics. and it was a pic not indicating that we were a couple so it was ok to keep up.
This same rule applies for people that have ex's, are not dating, but are openly looking. You still have those "couple" pics of you and your ex. That to me right there tells me that there's still feelings. If there wasn't, then take if off. Simple fix right? and the girls/guys that you are trying to "talk to" will not have a reason to keep their distance. I'm in a situation where I'm keeping my distance. You can't point it out to them, they need to take it down themselves. I have no right to tell someone what to keep up and what to take down. I just know how I see things, and if people don't see them the same way as I do. Then I move on. No harm no foul :-)