• Yes, it's perfectly acceptable to pin things just because you want to. Just keep in mind that the pins on your business account should be linked to your business – and the content you publish for it. Also, if you have any boards or pins that aren't connected, keep them 'hidden.'
• Because it's a kind thing to do, when you pin other people's pins, they're more likely to return to your Pinterest profile and re-pin important stuff you've authored.
• They also want to read your blog entries and acquire something useful from them.
• Furthermore, because your Pinterest profile isn't just a walking advertisement, your audience will spend more time on it, resulting in more click-throughs and re-pins.
• Increasing your traffic and making your postings more visible to a wider audience.

Read More: How can you get people to share your website on Pinterest?