That depends. You should obtain a divorce from your existing civil union if you plan to marry someone else in a state where civil unions or same-sex marriages are legal. Most places that permit same-sex marriage also recognize civil unions as legal marriages.
If you marry someone else in a state where same-sex marriages or civil unions are not recognized, then you risk having your marriage voided when crossing certain state lines or nullified should the law in your state change. Your marriage could become void and your civil union return to effect if you do not divorce your civil union partner before marrying someone else.
For tax/governmental purposes you are single unless you are officially married or have an official civil union.
No, that's a common-law marriage.
It means the same thing on Facebook that it means in real life. Civil unions are like marriages, except they deny the couple federal recognition, as well as use of the word "marriage." They may also deny specific rights at the state level, such as the right to use your spouse's surname.
Depending upon where you live, it is either marriage, civil union, civil partnership or domestic partnership.
No. In jurisdictions where civil unions are legal, only two parties are permitted for each civil union and no applicant can already be in a civil union with another person.
Yes, you do not have to get married in the same state in which you live.
In the state in which you will get married.
No. Civil unions, which New Jersey still offers despite having legalized same-sex marriage, is the equivalent of marriage in that state, except that it is called a "civil union" and it is not recognized by the US federal government. Civil unions are only for same-sex couples in New Jersey. Domestic partnerships have fewer rights, no federal recognition and are available to same-sex or opposite-sex couples. Domestic partners are required to live together, but civil union partners are not required to live together. Domestic partnerships are dissolved administratively by a single form, civil unions are dissolved by divorce proceedings in a state court.
It should be in the state your currently live in.
The people may of just chosen to put a civil union relationship on Facebook even if they don't live together.
If you get married in another state besides IOWA
You need to do exactly as I did. I obtain a divorce decree from the New York State Supreme Court in the New York county in which I live. New York considers your Vermont Civil Union to be a marriage and the only way out of it is divorce. The process is the same as any other divorce in New York.