facebook chat can you help all answers appreciated?

[dan]

so I sent a message and it tells me it was seen at a time I was on at yet however the person never showed up that they were on chat at that time are they blocking me from seeing them on

[Daniel]

They Probably Have there Chat Turned off Either That Or They Are Online But Only Offline to you

[M]

They probably just have their chat settings set to "offline" and aren't appearing online to anyone. A lot of people do this if they're not available to have a conversation at the time, so the person most likely isn't just blocking you...although that could be possible if mutual friends see that person online when you don't.