Commenting to summerbl4ck. I see your point about privacy for our clients. You make a good point. Portrait photographers have been using traditional portfolios and making them public at trade shows, art fairs and chamber of commerce events for years. The same rules apply with social media. Always ask your clients if you can use their images for self promotion (maybe even have them sign a waiver and specify what marketing channels you will be using). Maintaining relationships with your clients is paramount, any amount of advertising is not worth losing goodwill. Thanks,K.
http://allin1panel.com/blog/low-social-media-marketing-exposed/