You have the option to send the same message to a large number of users at once with the mass message feature. You will find it in the Messages panel, in the header next to the settings button. Note that there are only two groups of users you can send the mass message to: Fan Club subscribers and Friends.
You can also send paid mass messages. These should contain content, either photos or videos, that you can attach to your message (up to 5). You set the price of your choice, and users will have to pay the amount to unlock the footage.
There's a limit of only one mass message per day. Moreover, you can't send two or more paid messages in a row. So, for example, if you send a paid mass message today, tomorrow it has to be a free one.