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private int postCount;
    private Language language = Language.ENGLISH;
    private int pageSize = DEFAULT_PAGE_SIZE;
    private String location;
    private String signature;
    private DateTime registrationDate;
    private boolean enabled;

    public static final int MAX_SIGNATURE_SIZE = 255;
    public static final int MAX_LOCATION_SIZE = 30;

    public static final int DEFAULT_PAGE_SIZE = 50;
    public static final int[] PAGE_SIZES_AVAILABLE = new int[]{5, 10, 20, 50, 100, 250};

    private static final long serialVersionUID = 19981017L;
    private Set<UserContact> contacts = new HashSet<UserContact>();
    private List<Group> groups = new ArrayList<Group>();
    
    private DateTime avatarLastModificationTime = new DateTime(System.currentTimeMillis());

    /**
     * Only for hibernate usage.
     */
    protected JCUser() {
    }