In general, the use of Employee advocacy enhances the social media reach by 500+%. It increase the brand equity by 20% (internal research).
I have tried to list some of the free tools/apps which can be used for employee advocacy - these are the tools/ apps which works best for
1.) Email : Email continues to be one the best employee advocacy tool. It can be easily created. The main task here is to send information to employees which they will feel good to share with others. So , the content of the email is critical. It is advisable to avoid generic newsletter. In case it unavoidable, try segregating the newsletter into different groups so that your target employee easily finds the group and reads/ shares the information. There should be consistency in the quality of content in the newsletter. You can keep the newsletter weekly/ biweekly and try not to skip it. For consistency, you can use various curation tools. Feedly can be one tools which can use.
2.) 3rd Party tools : Use tools like paper.li and list.ly . You can automate the content curation by using zapier and ifttt. For more details, you can reach out to me at email@example.com
3.) Use LinkedIn Page: You can create a group or use a company showcase page. You can then keep curating the content which you want your users to share.
Here i have steered away from corporate employee advocacy tools and given some options for free/ easily available apps.
Do let me know your thoughts/ feedback in the comments sections.