Well, if they see you online all day, then they must be online all day as well
They see last time you were logged on. After initial exchange there will be some kind of sht test. For all those that went cold on you after exchange, it's safe to assume her sht test you online too often, or replying to quickly, or combination of both.
Woman online is like this - she there and she gets dozens of dcks wanting to bone her. By you being there and replying that often, you immediately disqualify yourself.
After she don't reply, what most people do? They write again, and again, and again, and again. Hi. Hello. Are you there. Question marks.
Then when she logs on, they write again.
They don't ever get sht.
Leave those women alone.