11. A non-transitory computer readable storage medium storing computer-executable instructions that, when executed by at least one processor, perform a method comprising steps of: acquiring text content input by a user in a microblog text box; monitoring a posting operation instruction for the text content; calculating the number of characters of the text content; determining whether the number of the characters of the text content exceeds a preset threshold; converting the text content into a format of messages, including the format of a picture, according to a user selection from a plurality of format settings, and posting the converted format of messages as a microblog message on a network if the number of the characters of the text content exceeds the preset threshold, the number of the characters contained in each microblog message being less than the preset threshold; and posting the text content as the microblog message on the network, if the number of the characters of the text content does not exceed the preset threshold.
16. The non-transitory computer readable storage medium according to claim 11 , wherein, after converting the text content into a picture, the instructions further perform the steps of: converting a first sentence of the text content as a title of the picture; and posting the picture with the title as a microblog message.