Complete website like Buffer.com with all options

We have a requirement to build one simple wizard that will let users utilize the inbuilt sharing and viral capabilities of different Social sites to promote their web link to different Social sites. Users can also schedule the postings, utilizing different sharing options. You need to have core knowledge of APIs provided by Social Media channels (e.g. knowledge of Graph API for Facebook). Apps will be built across each of the following: Facebook Twitter Google+ Instagram Pinterest Linked-In Telegram <<---------------Please bid only if you have knowledge of above. I also need to check your previous work in the same field i.e Use of multiple Social Sites API's on one Page.---------------->> The project is 90% dependent on the use of Social sites API's.