Nope, burst posting or spamming post won't help you to increase your rank. Your rank will increase every 2 weeks, and by posting more (spam) you could be tagged or listed as a spammer. In return, you will have the hard time to join in any campaigns available. Make your post constructive as possible, meaning your post must be related to the topic and on point, standard length is 70-75 characters, do just post for the sake of posting since most of the campaign managers look into it and having a constructive posts could help you land a position in a campaign.