Looking for good online drawing programs

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I used the "Doodle Too" online drawing, with that I can draw with other guests to help each other with drawings, but those drawings fade off in just couple minutes & chat message from that stays visible for only couple seconds; there's not always a member or guess who can help me with drawings or to respond to my chat message. What other online drawing will you suggest that where other guests helps me with drawings, & that my drawings don't fade or disappear there? If the other online drawing you just suggested won't work, then I'll ask for another different online drawings Then I'll soon send you message(s) about other kinds of online drawing site(s)