You can create engaging content on Instagram to attract clients or do targeted outreach to connect with your ideal audience. From personal experience with another service, the outreach approach requires a high volume to achieve results. But the effectiveness depends on the quality of your work...
Not sure why you would want to do this. Myspace used to be a great place to spam your links. But, they fixed this particular exploit months ago. Now, your link is scrambled, so of no value for SEO or MMO.