High blood calcium (hypercalcemia) is a condition of too much calcium in your blood.igh blood calcium (hypercalcemia) is a condition of too much calcium in your blood.
Hiding and revealing your Facebook presence is easy, requiring only a few clicks. Sign in to your Facebook account and click the Chat box in the lower-right corner of any page. Click Options and select Go Offline to hide your name from Friends On Chat lists.ou can see a list of your available friends in two spots. The Friends On Chat list appears in the left column of your homepage, and the Chat box is in the lower-right corner of all pages.
As you can tell, until Facebook Chat gives you a tool to manually recall and unsend chat messages, your main strategy is to be careful in the first place. Chances are that you won't be as lucky as having a chance to fall into one of the three scenarios we just mentioned.