Small riddles - What could it be?

[st_ghost]

Sponge

 

[cassandra31eee]

A sponge, yes.

 

[Vattier]

I am a wave, a gentle sound,You may not hear me, when I am around.I send messages, that one can hear,I don't need a password, just You to be near.If You still don't know what I am,Look on the forum - I'm part of one nickname...

 

[ifayra]

a whisper wind? ;D

 

[Vattier]

a whisper wind?