Definition: A view is a representation of a SQL statement that is stored in memory so that it can be re-used. A view is a logical entity or logical table that is essentially a SQL statement stored in the database in the system tablespace.
As it turns out, it's very likely that your Facebook and Twitter messages are better protected from government snoops than your phone texts, even when you send them from the same device.
When sending a message, a blue send button in the Message app denotes the message will be sent via iMessage; a green button denotes SMS or MMS. Finally, iMessage does have a tendency to go offline on occasion.