With that said I have listed here a few websites that you should definitely check for your portfolio.
1. 500px - Easily one of the best photography communities out there. I personally have an account here and I dig the straight-forward look of my portfolio. You should definitely check out the Editors' Choice as well as the Upcoming sections for a good dose of inspiration. They also have a rating system that is simple yet a nice touch plus the metadata of the image is also displayed but I highly disregard that since I'm concerned more with the photo.
I seriously don't find any cons with 500px since as a free user I can upload 20 photos weekly and have a limited number of photos to show in my portfolio, but if you can pay $49.95 a month then you can have unlimited uploads, premium portfolios, personalized domain, tech support and of course Google Analytics.
Tumblr also has this endless scrolling feature where you can just scroll down forever as long as there is content to see. On top of that you don't need to pay for anything for unlimited uploads but if you have the money you can have a personalized domain name which is definitely awesome as well as premium themes as I have said earlier.
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Not only that Red Bubble is a great art community (do check their blogs post) where you can share your works as well sell them. You could do collaborative work with other members which is a great way to improve and learn as a budding photographer.
4. Fotolouge - I haven't been using my Fotolouge for quite sometime now since there's 500px and Tumblr and let's not forget that the website is in Japanese and there's no way to translate it unless you understand Nihonggo. What I like about Fotolouge is the look of you portfolio, nothing fancy just your latest works moving from right to left like sushi in a conveyor belt. On top of that there is a 20mb monthly upload limit which is not a big deal if you are uploading 300kb-600kb images in 72dpi.
Clean and stunning web layout but it doesn't take you away from your photos. It is also a nice website to share your photos since they have a community there and isn't it cooler to see what does the Japanese say about your work.
A good starting point for everyone since you need to train yourself to strain which work is hot and which is not.