What is the ruling on some members in Islamic forums sharing unauthentic hadiths, or posting pictures that are inconsistent with Islamic teachings, or signatures that include images of men and women in indecent postures, for the purpose of increasing participation and raising their status?

What has been mentioned about some participants in Islamic forums — their striving to increase posts and raise their profile without considering reward or spreading the Sunnah, and their use of avatars of artists or nude women, and posting pictures containing indecent scenes, and a girl expecting a picture of a girl being hugged by a man, and worse than that, lying about the Prophet, peace and blessings be upon him — indicates that these forums are not Islamic but rather satanic. They must repent to Allah and abandon this deviation; for Allah Almighty says: "And do not cooperate in sin and aggression" and "That they may bear their burdens in full on the Day of Resurrection, and some of the burdens of those whom they misguide without knowledge. Unquestionably, evil is that which they bear." And the Prophet, peace and blessings be upon him, said: "Whoever lies about me, let him take his seat in Hellfire," and "Whoever calls to misguidance will bear a burden of sin equivalent to the sins of those who follow him, without diminishing anything from their sins." Thus, they are following the footsteps of Satan.