Online, at any given community, you have little to no rights.
Terms of Services usually outline it well.
"You agree that LiveJournal, in its sole discretion, may terminate your password, journal, or account, and remove and discard any content within the Service, for any reason, including and without limitation, the lack of use, or if LiveJournal believes that you have violated or acted inconsistently with the letter or spirit of the TOS. Any contracts, verbal or written or assumed, in conjunction with your deleted journal and all its parts, at LiveJournal's discretion, will be terminated as well. LiveJournal may also, in its sole discretion and at any time, discontinue providing the Service, or any part thereof, with or without notice. You agree that any termination of your access to the Service under any provision of this TOS may be effected without prior notice, and acknowledge and agree that LiveJournal may immediately deactivate or delete your LiveJournal journal and all related information and files. LiveJournal reserves the right to bar any further access to such files or the Service. You agree that LiveJournal shall not be liable to you or any third-party for any termination of your access to the Service. Paid accounts that are terminated will not be refunded."
"YOU EXPRESSLY UNDERSTAND AND AGREE THAT LIVEJOURNAL SHALL NOT BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, CONSEQUENTIAL OR EXEMPLARY DAMAGES, INCLUDING BUT NOT LIMITED TO, DAMAGES FOR LOSS OF PROFITS, GOODWILL, USE, DATA OR OTHER INTANGIBLE LOSSES (EVEN IF LIVEJOURNAL HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES), RESULTING FROM: (i) THE USE OR THE INABILITY TO USE THE SERVICE; (ii) THE COST OF PROCUREMENT OF SUBSTITUTE GOODS AND SERVICES RESULTING FROM ANY GOODS, DATA, INFORMATION OR SERVICES PURCHASED OR OBTAINED OR MESSAGES RECEIVED OR TRANSACTIONS ENTERED INTO THROUGH OR FROM THE SERVICE; (iii) UNAUTHORIZED ACCESS TO OR ALTERATION OF YOUR TRANSMISSIONS OR DATA; (iv) STATEMENTS OR CONDUCT OF ANY THIRD PARTY ON THE SERVICE; OR (v) ANY OTHER MATTER RELATING TO THE SERVICE."
You signed any rights you have away to privacy on their site the moment you agreed to the TOS.